c# contains

C＃List <T> .Contains()方法 (C# List<T>.Contains() Method)

List<T>.Contains() method is used to check whether list contains a specified element or not.

List <T> .Contains()方法用于检查list是否包含指定的元素。

Syntax:

句法：

    bool List<T>.Contains(T item);

Parameter: It accepts an item of type T.

参数：接受类型T的项目 。

Return value: It returns a Boolean value. true if list contains the item, false if list does not contain the item.

返回值：返回一个布尔值。 真如果列表中包含的项目， 否则为false列表中不包含的项目。

Example:

例：

    int list declaration:
    List<int> a = new List<int>();

    adding elements:
    a.Add(10);
    a.Add(20);
    a.Add(30);
    a.Add(40);
    a.Add(50);
    
    checking an item:
    a.Contains(10)
    
    Output:
    true

使用List <T> .Contains()方法检查列表中项目的C＃示例 (C# Example to check an item in the list using List<T>.Contains() Method)

using System;
using System.Text;
using System.Collections.Generic;

namespace Test
{
    class Program
    {
        static void printList(List<int> lst)
        {
            //printing elements
            foreach (int item in lst)
            {
                Console.Write(item + " ");
            }
            Console.WriteLine();
        }

        static void Main(string[] args)
        {
            //integer list
            List<int> a = new List<int>();

            //adding elements
            a.Add(10);
            a.Add(20);
            a.Add(30);
            a.Add(40);
            a.Add(50);

            //print the list
            Console.WriteLine("list elements...");
            printList(a);

            //finding elements
            if (a.Contains(10))
                Console.WriteLine("List contains 10");
            else
                Console.WriteLine("List does not contain 10");

            if (a.Contains(60))
                Console.WriteLine("List contains 60");
            else
                Console.WriteLine("List does not contain 60");

            //hit ENTER to exit
            Console.ReadLine();
        }
    }
}

Output

输出量

list elements...
10 20 30 40 50
List contains 10
List does not contain 60

翻译自: https://www.includehelp.com/dot-net/list-t-contains-method-with-example-in-c-sharp.aspx

c# contains